<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>交错动画</title>
    <style>
        .loading{
            display: flex;
            flex-wrap: wrap;
            height: 200px;
            width: 200px;
            align-content: space-around;
            justify-content: space-between;
        }
        .dot{
            border: solid red;
            height: 4em;
            width: 4em;
            border-radius: 50%;
        }
        
    </style>
</head>
<body>
    <div class="loading">
        <div class="dot"></div>
        <div class="dot"></div>
        <div class="dot"></div>
        <div class="dot"></div>
        <div class="dot"></div>
        <div class="dot"></div>
    </div>
</body>
</html>